US6459874B2ExpiredUtilityPatentIndex 63

Developing system for forming a full-color image

Assignee: MINOLTA CO LTDPriority: Feb 14, 2000Filed: Feb 8, 2001Granted: Oct 1, 2002

Est. expiryFeb 14, 2020(expired)· nominal 20-yr term from priority

Inventors:INOUE MASAHIDE ANNO MASAHIRO TSUTSUI CHIKARA NAKAMURA MINORU KUROSE KATSUNORI

G03G 13/0133G03G 2215/0177

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Claims

Abstract

A developing system is provided for forming a full-color image, which includes(i) a first developing device which is equipped with a developer-supporting member having a mean crest distance (Sm) of 20-200 mum on its surface and satisfying the following relation:(ii) a second developing device which is equipped with a developer-supporting member having a mean crest distance (Sm) of 20-200 mum on its surface and satisfying the following relation:wherein tan delta (50° C.) of the black toner is not more than 1.0, and a first ratio of tan delta and a first ratio tan 6 represented by (tan 8 (150° C.) of the first color toner (tan 8 (150° C.) of the black toner satisfies the following relation:

Claims

exact text as granted — not AI-modified

What is claimed is:  
     
       1. A developing system for forming a full-color image which comprises 
       (i) a first developing device which is equipped with a developer-supporting member which carries one-component developer including a black toner and a regulating member which forms a thin layer of the black toner on the developer-supporting member, said developer-supporting member having a mean crest distance (Sm) of 20-200 μm on its surface and satisfying the following relation:  
       
         
             d   50   /Ra= 0.5-3.0  
         
       
        (wherein d 50  is a weight-average particle size (μm) of the black toner, and Ra is a surface roughness (μm) of the developer-supporting member), and  
       (ii) a second developing device which is equipped with a developer-supporting member which carries one-component developer including a first color toner and a regulating member which forms a thin layer of the first color toner on the developer-supporting member, said developer-supporting member having a mean crest distance (Sm) of 20-200 μm on its surface and satisfying the following relation:  
       
         
             d   50   /Ra= 0.5-3.0  
         
       
        (wherein d 50  is a weight-average particle size (μm) of the first color toner, and Ra is a surface roughness (μm) of the developer-supporting member),  
       wherein tan δ (150° C.) of the black toner is not more than 1.0, and a first ratio of tan δ represented by (tan δ (150° C.) of the first color toner)/(tan δ (150° C.) of the black toner) satisfies the following relation:  
       
         
           1.1≦the first ratio of tan δ≦1.35; and wherein  
         
         
           
             
               
                 
                   
                     
                       tan 
                        
                       
                           
                       
                        
                       δ 
                     
                     = 
                     
                       
                         
                           loss of elastic modulus  
                           
                             ( 
                             
                               G 
                               ″ 
                             
                             ) 
                           
                         
                         
                           storage elastic modulus  
                           
                             ( 
                             
                               G 
                               ′ 
                             
                             ) 
                           
                         
                       
                       . 
                     
                   
                 
                 
                   
                       
                   
                 
               
             
           
           
           
               
           
         
       
     
     
       2. The developing system of  claim 1 , wherein tan δ (150° C.) of the black toner and the first ratio of tan δ satisfy the following relations: 
       
         
           0.85≦tan δ(150° C.)≦1.0  
         
       
       
         
           1.2≦the first ratio of tan δ≦1.30.  
         
       
     
     
       3. The developing system of  claim 1 , wherein the developer-supporting member of the first developing device has the mean crest distance (Sm) of 40-100 μm and satisfies the following relation: 
       
         
             d   50   /Ra =0.7-2.5,  
         
       
       and the developer-supporting member of the second developing device has the mean crest distance (Sm) of 40-100 μm and satisfies the following relation: 
       
         
             d   50   /Ra =0.7-2.5.  
         
       
     
     
       4. The developing system of  claim 1 , wherein the mean crest distance (Sm) of the first developing device is larger than that of the second developing device, and d 5 /Ra relating to the first developing device is smaller than that relating to the second developing device. 
     
     
       5. The developing system of  claim 1 , wherein it comprises 
       (i) a third developing device which is equipped with a developer-supporting member which carries one-component developer including a second color toner and a regulating member which forms a thin layer of the second color toner on the developer-supporting member, said developer-supporting member having a mean crest distance (Sm) of 20-200 μm on its surface and satisfying the following relation:  
       
         
             d   50   /Ra= 0.5-3.0  
         
       
        (wherein d 50  is a weight-average particle size (μm) of the second color toner, and Ra is a surface roughness (μm) of the developer-supporting member), and  
       (ii) a fourth developing device which is equipped with a developer-supporting member which carries one-component developer including a third color toner and a regulating member which forms a thin layer of the third color toner on the developer-supporting member, said developer-supporting member having a mean crest distance (Sm) of 20-200 μm and satisfying the following relation:  
       
         
             d   50   /Ra= 0.5-3.0  
         
       
        (wherein d 50  is a weight-average particle size (μm) of the third color toner, and Ra is a surface roughness (μm) of the developer-supporting member),  
       wherein a second ratio of tan δ represented by (tan δ (150°) of the second color toner)/(tan δ (150° C.) of the black toner) satisfies the following relation:  
       
         
           1.1≦the second ratio of tan δ≦1.35, and a third ratio of tan δ represented by (tan δ (150° C.) of the third color toner)/(tan δ (150° C.) of the black toner) satisfies the following relation:  
         
       
       
         
           1.1≦the third ratio of tan δ≦1.35.  
         
       
     
     
       6. The developing system of  claim 1 , wherein each of the black toner and the first color toner is a nonmagnetic toner. 
     
     
       7. The developing system of  claim 6 , wherein each of the black toner and the first color toner has a mean roundness of not less than 0.950, a standard deviation of roundness of not more than 0.040 and D/d 50  of not less than 0.4, wherein D equals 6/(ρ·S) (wherein ρ is a true density (g/cm 3 ) of the toner, and S is BET specific surface area of the toner). 
     
     
       8. The developing system of  claim 7 , wherein each of the black toner and the first color toner has the mean roundness of not less than 0.960, the standard deviation of roundness of not more than 0.035 and D/d 50  of 0.40-0.80. 
     
     
       9. The developing system of  claim 5 , wherein each of the black toner, the first color toner, the second color toner and the third color toner is a nonmagnetic toner. 
     
     
       10. The developing system of  claim 9 , wherein each of the black toner, the first color toner, the second color toner and the third color toner has the mean roundness of not less than 0.950, the standard deviation of roundness of not more than 0.040 and D/d 50  of not less than 0.40, wherein D=6/(ρ·S)(wherein ρ is a true density (g/cm 3 ) of the toner, and S is BET specific surface area of the toner). 
     
     
       11. The developing system of  claim 10 , wherein each of the black toner, the first color toner, the second color toner and the third color toner has the mean roundness of not less than 0.960, the standard deviation of roundness of not more than 0.035 and D/d 50  of 0.40-0.80. 
     
     
       12. The developing system of  claim 1 , wherein the black toner is a magnetic toner, and the first color toner is a nonmagnetic toner. 
     
     
       13. The developing system of  claim 12 , wherein the black toner has a mean roundness of not less than 0.950, the standard deviation of roundness of not more than 0.040 and D/d 50  of not less than 0.20, and the first color toner has a mean roundness of not less than 0.950, the standard deviation of roundness of not more than 0.040 and D/d 50  of not less than 0.40, wherein D=6/(ρ·S)(wherein ρ is a true density (g/cm 3 ) of the toner, and S is BET specific surface area of the toner). 
     
     
       14. The developing system of  claim 5 , wherein the black toner is a magnetic toner, and each of the first color toner, the second color toner and the third color toner is a nonmagnetic toner. 
     
     
       15. The developing system of  claim 14 , wherein the black toner has a mean roundness of not less than 0.90, the standard deviation of roundness of not more than 0.040 and D/d 50  of not less than 0.20, each of the first color toner, the second color toner and the third color toner has the mean roundness of not less than 0.950, the standard deviation of roundness of not more than 0.040 and D/d 50  of not less than 0.40, wherein D=6/(ρ·S)(wherein ρ is a true density (g/cm 3 ) of the toner, and S is BET specific surface area of the toner). 
     
     
       16. The developing system of  claim 15 , wherein the black toner has a mean roundness of not less than 0.960, the standard deviation of roundness of not more than 0.035 and D/d 50  of 0.20-0.55, and each of the first color toner, the second color toner and the third color toner has the mean roundness of not less than 0.960, the standard deviation of roundness of not more than 0.035 and D/d 50  of 0.40-0.80. 
     
     
       17. The developing system of  claim 5 , wherein a first inorganic particle and a second inorganic particle whose specific surface area is different from that of the first inorganic particle are externally added to the black toner, the first color toner, the second color toner and the third color toner. 
     
     
       18. The developing system of  claim 17 , wherein an absolute value of a difference between BET specific surface area of the first inorganic particle and that of the second inorganic particle is not less than 30 m 2 /g. 
     
     
       19. The developing system of  claim 17 , wherein a third inorganic particle and a fourth inorganic particle whose BET specific surface area is different from that of the third inorganic particle are fixed to the black toner, the first color toner, the second color toner and the third color toner. 
     
     
       20. The developing system of  claim 1 , wherein the regulating member is an elastic blade whose thickness is 0.08-0.2 mm.

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